Tool for making a circumferential bead or swage of predetermined size in metal pipes



Nov. 3, 1953 TOOL FOR MAKING A CIRCUMFERENTIAL BEAD OR SWAGE OF PREDETERMINED SIZE IN METAL PIPES Original Filed Feb. 21, 1946 W R. CHAMPION 6 5 2\ Z (J L r 1 I? D? INVENTOR (Jill/u 78060-1 (ham awn; durum! 6 Jim-y dun [ham afar and 7:144 KennEif/p (ar :enfe7;6frca ars By MM W Patented Nov. 3, 1955 TOOL FOR MAKING A CIRCUMFERENTIAL BEAD OR SWAGE F PREDETERMINED SIZE IN METAL PIPES William Robert Champion, deceased, late of Croxley Green, England, by Mary Ann Champion, Croxley Green, and Jack Kenneth Carpenter, Watford, England, executors Original application February 21, 1946, Serial No.

649,202, now Patent No. 2,582,746, dated January 15, 1952. Divided and this application February 28, 1951, Serial No. 213,264

Claims priority, application Great Britain April 30, 1945 r 1 Claim. (Cl. 153-73) This invention relates to a tool for forming a circumferential swage or head on the outside of a pipe or tube and has for its object the simplification and improvement of the design and construction of such a tool so as to facilitate the adjustments thereof thereby rendering the tool veryemcient, and quick and reliable in use. This application is a division of application Serial Number 649,202, filed February 21, 1946, in the name of W. R. Champion, and issued January 15; 1952, as Patent No. 2,582,746.

The invention is further described with reference to the accompanying drawings, wherein similar references indicate corresponding parts.

Figure 1 is a central longitudinal sectional view dimensioned so as to make a sliding fit in the end of the pipe or tube to be swaged and is provided with equally spaced circumferentially disposed perforations 2a through which corresponding expanding elements or, steel balls 3 can be partly protruded by means of an adjustable mandrel mounted within the internally threaded sleeve, l.

The mandrel comprises a threaded collar or of such perforations while the inner sides of the steel balls contact'the section 5 and the coned terminal section 6 of the mandrel as the latter is screwed into and out of the internally threaded sleeve 1. a

When the mandrel is screwed out of the internally threaded sleeve I, the section 5 is withdrawn from the bore of the reduced extension 2a of the sleeve as shown in Figure 3, so that the coned terminal section 6 of the mandrel is brought into register with the perforations 2a in which the steel balls 3 are carried, to enable the same to be returned into the bore of the reduced section of the sleeve sufiiciently to lie flush with of the spigot end thereof formed by the swaging.

operation as indicated in Figures 1 and 3.

For use,the mandrel is screwed out of the sleeve until one end of its threaded collar 4 abuts the inner surface of the guide 8 secured in the outer end of the internally threaded sleeve i so in a contrary direction to cause the coned section 6 to engage the balls 3 to press them hard 7 against the interior wall of the pipe. Since the section t that is of larger diameterthan the rest V of the mandrel and a section f uniform diameter which is adapted to make asliding fit in the bore of the reduced laterally perforatedcylindrical extension 2 of the sleeve and terminates in the larger end of a conedterminal. section ii I of the mandrel on one side of the threaded collar,

while an extension i of the. mandrel projects from the opposite side of the threaded collard and works through, a removable centrally perforated guide 8 secured in the open end of the internally threaded sleeve i, the projecting extension "I of the mandrel being furnished with a lever or' steel balls 3 housed therein so that the latter can only be partly protruded through the outer ends balls are now also pressed hard against themandrel, further rotation of the latter will cause the sleeve l to be carried'with it and a circumferential score will be made in the interior wall of the pipe. When the score has been made the" friction between the balls and the mandrel will be reduced but as the score or partly formed swage nowengages a larger surface area of each ball than before, the mandrel can now beturned further into the sleeve without rotation of the sleeve. Thus the friction is again increased between the balls and the coned section and as before the sleeve will rotate with the mandrel and the score made by the balls will be deepened] Thus, the process is-repeated until the balls ride on" the plane cylindrical part of the mandrel when the swage will be fully formed, the projection of the swage from the exterior wall of the pipe being finally determined by the diameter of the plane cylindrical part of the mandrel. Thus, it will be seen that the whole process can be performed in a continuous manner and with the exception of the initial holding of the sleeve l, the operation can be done by one hand; If the. reduced extension 2 of the sleeve. makes: a fairly tight fit in the pipe, the initial holding of the pipe will be unnecessary.

The mandrel is then withdrawn fromlthe'sleeve until the adjacent face of its threaded collar abuts the inner face of the perforated guide 8 se-- cured in the open end of the internally threaded sleeve I so that the protruded steel balls" can be readily returned into the perforations 2a of the reduced extension 2 of the sleeve and lie flush with the outer surface thereof as the sleeve is withdrawn from the swaged pipe end A.

What is claimed is:

A tool for making a circumferential head or swage of predetermined size in ductile metal pipes comprising a mandrel having a, threaded section of. greater diameter than that of the rest of the mandrel, a sleeve having a threaded axial: bore for engagement by the threaded section on the mandrel, the length of the threaded bore relative to the width of said threaded section being such that the mandrel may be turned and moved axially relatively to the sleeve, a guide; cap fitting over the bore and: having an. axial; hole through which one end of the mandrel projects, the. cap and said. threaded section of the mandrel also serving to limit the outward movement of the mandrel, means on the projecting end of the mandrel for efiecting: the manual operationof the expander, a coned section at the other end 4 of the mandrel and a plane cylindrical section between the threaded section and the coned section, an extension of reduced diameter at the end of the sleeve opposite to the guide cap, a shoulder between the sleeve and the extension so that. the extension may be inserted into the borev of a pipeor tube to be swaged with the shoulder abutting the end of the pipe or tube, transverse apertures in the extension and an expanding. element in each aperture, the arrangementbeing such that as the mandrel is screwed continuously into the sleeve the coned section thereof engages the elements which are forced outwardly to: form a circumferential swage of predetermined size, the plane cylindrical part of the mandrel finally engaging the elements to gauge the final projection of the swage.

MARY ANN CHAMPION, JACK KENNETH CARPENTER, Execute rs of the last will and testament of William Robert Champion, deceased.

References Cited in the file of this patent UNITED STATES PATENTS 

